> For the complete documentation index, see [llms.txt](https://hub.bsvblockchain.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hub.bsvblockchain.org/bsv-skills-center/important-concepts/details/spv/payments-flow.md).

# Payments Flow

Paymail Capability Extensions

The SPV Wallet uses Paymail capabilities to publicly reveal their ability to interpret SPV transaction data.

{% hint style="info" %}
**What is Paymail?**

It's a service discovery mechanism for counterparty web APIs. It allows users to pay something which looks like an email address, but under the hood resolves a specific endpoint for a wallet to use for payment negotiation.\
\ <mark style="color:yellow;">**<user@domain.tld>**</mark> -> *<mark style="color:blue;"><https://domain.tld/api/some/specific/endpoint></mark>*
{% endhint %}

### Sequence Diagram

<div data-full-width="true"><figure><picture><source srcset="/files/6zZJymauRq4CYBnOA40k" media="(prefers-color-scheme: dark)"><img src="https://2147185133-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWtK4ab0ntyPZBmGoKq4t%2Fuploads%2Fgit-blob-762867ca6c6ea9b82fd6a4c5f650857cbad78ebd%2Fswimlanes-43c7c4ee01b286fea3be26b28804e591.png?alt=media" alt=""></picture><figcaption></figcaption></figure></div>

### Capability Specifications

Further details on exactly how these requests and responses should be formulate are defined in these BRC documents:

{% embed url="<https://bsv.brc.dev/payments/0028>" %}
Getting Outputs to Pay To
{% endembed %}

{% embed url="<https://bsv.brc.dev/payments/0070>" %}
The Paymail Capability for Delivering SPV Transactions
{% endembed %}


---

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